Premium
Dosimetry of infant exposure to power‐frequency magnetic fields: Variation of 99th percentile induced electric field value by posture and skin‐to‐skin contact
Author(s) -
Li Congsheng,
Wu Tongning
Publication year - 2015
Publication title -
bioelectromagnetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.435
H-Index - 81
eISSN - 1521-186X
pISSN - 0197-8462
DOI - 10.1002/bem.21899
Subject(s) - percentile , medicine , bioelectromagnetics , non ionizing radiation , magnetic field , physics , mathematics , statistics , optics , quantum mechanics
Infant exposure to 50 Hz magnetic fields from power lines was numerically analyzed in this study. Dosimetric variability due to posture and skin‐to‐skin contact was evaluated using human anatomical models including a recently developed model of a 12‐months‐old infant. As proposed by the International Commission on Non‐Ionizing Radiation Protection, the induced E‐field strength (99th percentile value, E 99 ) for the central nerve systems ( E 99_CNS ) and peripheral nerve system ( E 99_PNS ), were used as metrics. Results showed that the single (free of contact with others) infant model has lower E 99 ( E 99_CNS and E 99_PNS inclusive) compared with single adult and child models when exposed to the same power‐frequency magnetic field. Also, studied postures of sitting, standing, or arm‐up, would not change E 99 _PNS . However, skin‐to‐skin contact with other models could significantly raise induced E‐field strength in the infant (e.g., contact on 0.93% of the infant's total surface increased E 99_PNS by 213%). Simulations with canonical models were conducted to assess different factors contributing to the E 99 enhancement. Results indicated the importance of thoroughly investigating the conservativeness of current safety guidelines in the case of skin‐to‐skin contact, especially with infants. Bioelectromagnetics. 36:204–218, 2015. © 2015 Wiley Periodicals, Inc.